Valve for motors.



no. 689,988. Patented nec. 3|, 190i. c. PIGUET.

VALVE FOR MUTURS.

(Application led Nov. 80, 1900.) (No Nudel.)

// y l l UNTTED STATES PATENT OFFICE.

CHARLES PIGUET, OF LYON-VAISE, FRANCE, ASSIGNOR TO LA SOCIT PIGUET du CIE., OF LYON-VAISE, FRANCE.

VALVE FOR MOTORS.

SPECIFICATION forming part of Letters Patent No. 689,988', dated December 31, 1901.

Application filed November 30, 1900. Serial No. 38,261. (No model To all whom, it 'litany concern:

Be itknown that I, CHARLES PIGUET, a citi- Zen of the Republic of France, residing at No. 2 Rue de Paris, Lyon-Vaise, in the department of Rhne and Republic of France, have invented a new and useful Improvement in Valves for Motors, of which the following is a specification.

The invention which forms the object of the present application for Letters Patent is designed to allow of motors working without noise or danger with exhaust-pressures variable within very wide limits. This result is obtained without it being necessary to vary the bore, the overlap, or the stroke of the escape-distributer--that is to say, Without altering the degree of compression given by the main stops or the exhaust-valve. Let us take, for example, a condensing-engine the degree of compression of which is suitably regulated, theoretically, in order that the pressure at the end of the stroke may attain a given amount. lf the exhaust-pressure be modied so as to bring` it up to or even above the atmospheric pressure without altering the amount of compression, a much higher pressure will be obtained toward the end of this period of compression than in the preceding case and even greatly exceeding the admission -pressure if the waste space is small. From this imperfection of the diagram there will result violent shocks to the cross-head of the motor and danger of breaking the mechanism, which is thereby subjected to greater strains than those for which it was constructed. My invention obviates these defects by doing away with their cause. For this purpose during the period of compression a portion of the motive fluid retained in the cylinder after the closing of the large stops or the exhaust-valves is allowed to escape. This prolonged ed uction is easily effected by means of an aperture kept open during the period of compression and closed during the periods of admission and expansion. These openings and closings are effected by the main valve alone. It is needless to describe all these means in detail in order to set forth the nature of this invention, and the application of the most simple one will now be described with reference to the accompanying drawings as obtained by means of a principal distributer in continuous rotation, doing away entirely with the auxiliary distributor.

The escape-outlet discharges into a pipe open to the air or discharging into the escape reservoir or collector, condenser, receiver, or the like. A plug placed along this pipe and operated from the outside of the motor allows the section of the prolonged eduction to increase or diminish, as desired. It will therefore be understood that both during the working or the stoppage of the motor by shifting the plug the quantityof Huid escapingthrough the outlet can be regulated and the compression be brought to a point which avoids shocks and obviates danger of breakage. It is obvious that the period of this prolonged eduction can be fixed with regard tothe results to be attained.

In the accompanying drawings, Figure l shows the vertical section on the line A B C of Fig. 2 of the motor-base provided with this invention. Fig. 2 is a plan view of Fig. l seen from the interior of the motor.

The escape-disk a is pierced by ports b, which in rotating open and close the fixed ports c, pierced in the base d of the motor and opening into the escape-chamber c. When the ports b of the distributing-disk d stop at the same point as the ports c of the base d, the eduction is terminated and compression begins. The fixed port f of the prolonged eduction will, however, still be in connection with the cylinder when the ports c of the base are closed, as will be seen from the drawings. The fixed port f can therefore prolong the eduction until the stoppage of the distributorport b closes it. At this moment the motorpiston will be near its dead-point and the period of admission about to com mcnce. The section of the fixed portfdetermines the period of the prolonged eduction. This port communicates with apipe g, which discharges into the escape-chamber e for the motive fluid, or even directly into the open, if working with free escape. There is a stop-cockin the pipegofany preferred kind-for instance, a conical valve, the point h of which can be made to press on its seat t' or move away therefrom. The cone is operated by means of a screw j, accessible from the exterior of the IOO base. By movingY the @one toward or away sure, in combination the base cl the ports c, from its seating the section of the pipe g can the fixed port f, the exit-tube g, the Valve h, be Varied at will, and consequently also the and the screw-shaft j.

quantity of the fluid discharged through the In testimony whereof I have signed my I5 ,5 prolonged eduetion. Vmarne to this specification in the presence of What I claim istwo subscribing Witnesses. l. In a motor adapted to be operated by a tinid4 under pressure, a main outlet, a main CHARLES PIGUET Valve,and a secondary adjustable outlet-chan- W'itnesses: no nel controlled by the said main valve. M. VACHON,

2. In a motor operated by a fluid under pres- Y. GIROD. 

